Re-submit 163654 - Fix initialisation of s_acceleratedAnimationEnabled flag.
Re-submit 163654 - Fix initialisation of s_acceleratedAnimationEnabled flag.

BUG=None

This originally broke some WebKit animation layout tests due to a bug in
DumpRenderTree which have since been fixed.

Review URL: https://chromiumcodereview.appspot.com/11238063

TBR=wjmaclean@chromium.org
Review URL: https://codereview.chromium.org/11225066

TBR=wjmaclean@chromium.org
Review URL: https://codereview.chromium.org/11264015

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@163901 0039d316-1c4b-4281-b951-d872f2087c98

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